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3 years ago

11

on a recent homework assignment, Eli needed to solve the equation d^2 = 49. He icorrectly wrote g = -7

1 answer:

Liula [17]3 years ago

5 0

Answer:

The solution set is {-7, 7}.

Step-by-step explanation:

He was half right .There are 2 solution d = -7 and d = 7.

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Find all solutions to 0= 2x^4+5x^3+38x^2+125x-300

Mariana [72]

$2x^4+5x^3+38x^2+125x-300=0\\\\2x^4+5x^3-12x^2+50x^2+125x-300=0\\\\x^2(2x^2+5x-12)+25(2x^2+5x-12)+0\\\\(2x^2+5x-12)(x^2+25)=0\\\Updownarrow\\1^o\ 2x^2+5x-12=0\ \vee\ 2^o\ x^2+25=0\\\\\\1^o\ \Delta=5^2-4\cdot2\cdot(-12)=25+96=121\\\\\sqrt\Delta=\sqrt{121}=11\\\\x_1=\frac{-5-11}{2\cdot2}=\frac{-16}{4}=-4;\ x_2=\frac{-5+11}{2\cdot2}=\frac{6}{4}=\frac{3}{2}\\\\\\2^o\ x^2=-25-false\\\\\\Answer:x=-4\ or\ x=\frac{3}{2}$

3 0

3 years ago

Erika worked 14 hours last week and 20 hours this week. If she earns $9 per hour, how much did she earn during these two weeks?

ozzi

we know that

Erika earns $\$9$ per hour

so

By proportion

Find how much she earn during the total hours of two weeks

The total hours of two weeks is equal to

$14+20=34\ hours$

$\frac{9}{1} \frac{\$}{hour} =\frac{x}{34} \frac{\$}{hours} \\ \\x=34*9 \\ \\x=\$306$

therefore

<u>the answer is</u>

$\$306$

4 0

3 years ago

Read 2 more answers

Scientists discovered an unknown planet 265,000 light years from Earth. A light year is about 5,880,000,000,000 miles.

sashaice [31]

Answer:

The answer is C. 1.5582 x 10^17

4 0

3 years ago

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Find the square root of 64a^2/9b^2+4+32a/3b

insens350 [35]

Answer:

the square root of 64a^2/9b^2+4+32a/3b is

( 8a + 6b ) / 3b

or

8a / 3b + 2

8 0

3 years ago

(1, 3) and (-3, -5)<br> write a linear equation given the two points

Firlakuza [10]

Answer:

y = 2x + 1

Step-by-step explanation:

1. Find the slope; (change in y values)/(change in x values)

Slope = (-5 - 3)/ (-3 - 1) = -8/-4 = 2

2. Find the y-intercept (b) using the slope intercept formula: y = mx + b

m = 2 and using point (1, 3) , solve for "b"

y = mx + b

3 = 2(1) + b

3 = 2 + b

1 = b

3. Write the linear equation: y = 2x + 1

7 0

2 years ago